Cisco CCNA mock exam questions sample test – Question 411

.What is the HSRP virtual router MAC address for the virtual router for HSRP group 31?

A. 0000.0c07.ac1f
B. ac1f
C. 0c07
D. 07.ac

Correct Answer: A

Explanation:
The Hot Standby Router Protocol (HSRP) virtual MAC address for the virtual router for HSRP group 31 is 0000.0c07.ac1f. A Media Access Control (MAC) address is a 6-byte value
that is unique for every networked device. MAC addresses are typically written in hexadecimal notation. The address 0000.0c07.ac1f is a MAC address for an HSRP virtual router; this
address can also be written as 00-00-0c-07-ac-1f or 00.00.0c.07.ac.1f. Hexadecimal letters can be written as either lowercase or uppercase letters.
The MAC address for an HSRP virtual router consists of the vendor ID, the HSRP code and the group ID. The vendor ID corresponds to the first three bytes of the MAC address. A
vendor ID of 0000.0c indicates that the device was manufactured by Cisco. The HSRP code corresponds to the fourth and fifth bytes of the MAC address. The HSRP code for a virtual
router is always equal to 07.ac. Finally, the group ID corresponds to the last byte of the MAC address. For example, a group ID of 1f, when converted to decimal, indicates that the
virtual router belongs to HSRP group 31.
Objective:
Infrastructure Services
Sub-Objective:
Configure, verify, and troubleshoot basic HSRP
References:
Internetworking Case Studies > Using HSRP for Fault-Tolerant IP Routing